drivers/mmc/host/sdhci-s3c.c - kernel/msm-4.9 - Gitiles

 /* linux/drivers/mmc/host/sdhci-s3c.c
  *
  * Copyright 2008 Openmoko Inc.
  * Copyright 2008 Simtec Electronics
  *      Ben Dooks <ben@simtec.co.uk>
  *      http://armlinux.simtec.co.uk/
  *
  * SDHCI (HSMMC) support for Samsung SoC
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/clk.h>
 #include <linux/io.h>

 #include <linux/mmc/host.h>

 #include <plat/sdhci.h>
 #include <plat/regs-sdhci.h>

 #include "sdhci.h"

 #define MAX_BUS_CLK	(4)

 /**
  * struct sdhci_s3c - S3C SDHCI instance
  * @host: The SDHCI host created
  * @pdev: The platform device we where created from.
  * @ioarea: The resource created when we claimed the IO area.
  * @pdata: The platform data for this controller.
  * @cur_clk: The index of the current bus clock.
  * @clk_io: The clock for the internal bus interface.
  * @clk_bus: The clocks that are available for the SD/MMC bus clock.
  */
 struct sdhci_s3c {
 	struct sdhci_host	*host;
 	struct platform_device	*pdev;
 	struct resource		*ioarea;
 	struct s3c_sdhci_platdata *pdata;
 	unsigned int		cur_clk;

 	struct clk		*clk_io;
 	struct clk		*clk_bus[MAX_BUS_CLK];
 };

 static inline struct sdhci_s3c *to_s3c(struct sdhci_host *host)
 {
 	return sdhci_priv(host);
 }

 /**
  * get_curclk - convert ctrl2 register to clock source number
  * @ctrl2: Control2 register value.
  */
 static u32 get_curclk(u32 ctrl2)
 {
 	ctrl2 &= S3C_SDHCI_CTRL2_SELBASECLK_MASK;
 	ctrl2 >>= S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;

 	return ctrl2;
 }

 static void sdhci_s3c_check_sclk(struct sdhci_host *host)
 {
 	struct sdhci_s3c *ourhost = to_s3c(host);
 	u32 tmp = readl(host->ioaddr + S3C_SDHCI_CONTROL2);

 	if (get_curclk(tmp) != ourhost->cur_clk) {
 		dev_dbg(&ourhost->pdev->dev, "restored ctrl2 clock setting\n");

 		tmp &= ~S3C_SDHCI_CTRL2_SELBASECLK_MASK;
 		tmp |= ourhost->cur_clk << S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;
 		writel(tmp, host->ioaddr + 0x80);
 	}
 }

 /**
  * sdhci_s3c_get_max_clk - callback to get maximum clock frequency.
  * @host: The SDHCI host instance.
  *
  * Callback to return the maximum clock rate acheivable by the controller.
 */
 static unsigned int sdhci_s3c_get_max_clk(struct sdhci_host *host)
 {
 	struct sdhci_s3c *ourhost = to_s3c(host);
 	struct clk *busclk;
 	unsigned int rate, max;
 	int clk;

 	/* note, a reset will reset the clock source */

 	sdhci_s3c_check_sclk(host);

 	for (max = 0, clk = 0; clk < MAX_BUS_CLK; clk++) {
 		busclk = ourhost->clk_bus[clk];
 		if (!busclk)
 			continue;

 		rate = clk_get_rate(busclk);
 		if (rate > max)
 			max = rate;
 	}

 	return max;
 }

 static unsigned int sdhci_s3c_get_timeout_clk(struct sdhci_host *host)
 {
 	return sdhci_s3c_get_max_clk(host) / 1000000;
 }

 /**
  * sdhci_s3c_consider_clock - consider one the bus clocks for current setting
  * @ourhost: Our SDHCI instance.
  * @src: The source clock index.
  * @wanted: The clock frequency wanted.
  */
 static unsigned int sdhci_s3c_consider_clock(struct sdhci_s3c *ourhost,
 					     unsigned int src,
 					     unsigned int wanted)
 {
 	unsigned long rate;
 	struct clk *clksrc = ourhost->clk_bus[src];
 	int div;

 	if (!clksrc)
 		return UINT_MAX;

 	rate = clk_get_rate(clksrc);

 	for (div = 1; div < 256; div *= 2) {
 		if ((rate / div) <= wanted)
 			break;
 	}

 	dev_dbg(&ourhost->pdev->dev, "clk %d: rate %ld, want %d, got %ld\n",
 		src, rate, wanted, rate / div);

 	return (wanted - (rate / div));
 }

 /**
  * sdhci_s3c_set_clock - callback on clock change
  * @host: The SDHCI host being changed
  * @clock: The clock rate being requested.
  *
  * When the card's clock is going to be changed, look at the new frequency
  * and find the best clock source to go with it.
 */
 static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock)
 {
 	struct sdhci_s3c *ourhost = to_s3c(host);
 	unsigned int best = UINT_MAX;
 	unsigned int delta;
 	int best_src = 0;
 	int src;
 	u32 ctrl;

 	/* don't bother if the clock is going off. */
 	if (clock == 0)
 		return;

 	for (src = 0; src < MAX_BUS_CLK; src++) {
 		delta = sdhci_s3c_consider_clock(ourhost, src, clock);
 		if (delta < best) {
 			best = delta;
 			best_src = src;
 		}
 	}

 	dev_dbg(&ourhost->pdev->dev,
 		"selected source %d, clock %d, delta %d\n",
 		 best_src, clock, best);

 	/* select the new clock source */

 	if (ourhost->cur_clk != best_src) {
 		struct clk *clk = ourhost->clk_bus[best_src];

 		/* turn clock off to card before changing clock source */
 		writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);

 		ourhost->cur_clk = best_src;
 		host->max_clk = clk_get_rate(clk);
 		host->timeout_clk = sdhci_s3c_get_timeout_clk(host);

 		ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
 		ctrl &= ~S3C_SDHCI_CTRL2_SELBASECLK_MASK;
 		ctrl |= best_src << S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;
 		writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL2);
 	}

 	/* reconfigure the hardware for new clock rate */

 	{
 		struct mmc_ios ios;

 		ios.clock = clock;

 		if (ourhost->pdata->cfg_card)
 			(ourhost->pdata->cfg_card)(ourhost->pdev, host->ioaddr,
 						   &ios, NULL);
 	}
 }

 static struct sdhci_ops sdhci_s3c_ops = {
 	.get_max_clock		= sdhci_s3c_get_max_clk,
 	.get_timeout_clock	= sdhci_s3c_get_timeout_clk,
 	.set_clock		= sdhci_s3c_set_clock,
 };

 static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
 {
 	struct s3c_sdhci_platdata *pdata = pdev->dev.platform_data;
 	struct device *dev = &pdev->dev;
 	struct sdhci_host *host;
 	struct sdhci_s3c *sc;
 	struct resource *res;
 	int ret, irq, ptr, clks;

 	if (!pdata) {
 		dev_err(dev, "no device data specified\n");
 		return -ENOENT;
 	}

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		dev_err(dev, "no irq specified\n");
 		return irq;
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(dev, "no memory specified\n");
 		return -ENOENT;
 	}

 	host = sdhci_alloc_host(dev, sizeof(struct sdhci_s3c));
 	if (IS_ERR(host)) {
 		dev_err(dev, "sdhci_alloc_host() failed\n");
 		return PTR_ERR(host);
 	}

 	sc = sdhci_priv(host);

 	sc->host = host;
 	sc->pdev = pdev;
 	sc->pdata = pdata;

 	platform_set_drvdata(pdev, host);

 	sc->clk_io = clk_get(dev, "hsmmc");
 	if (IS_ERR(sc->clk_io)) {
 		dev_err(dev, "failed to get io clock\n");
 		ret = PTR_ERR(sc->clk_io);
 		goto err_io_clk;
 	}

 	/* enable the local io clock and keep it running for the moment. */
 	clk_enable(sc->clk_io);

 	for (clks = 0, ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
 		struct clk *clk;
 		char *name = pdata->clocks[ptr];

 		if (name == NULL)
 			continue;

 		clk = clk_get(dev, name);
 		if (IS_ERR(clk)) {
 			dev_err(dev, "failed to get clock %s\n", name);
 			continue;
 		}

 		clks++;
 		sc->clk_bus[ptr] = clk;
 		clk_enable(clk);

 		dev_info(dev, "clock source %d: %s (%ld Hz)\n",
 			 ptr, name, clk_get_rate(clk));
 	}

 	if (clks == 0) {
 		dev_err(dev, "failed to find any bus clocks\n");
 		ret = -ENOENT;
 		goto err_no_busclks;
 	}

 	sc->ioarea = request_mem_region(res->start, resource_size(res),
 					mmc_hostname(host->mmc));
 	if (!sc->ioarea) {
 		dev_err(dev, "failed to reserve register area\n");
 		ret = -ENXIO;
 		goto err_req_regs;
 	}

 	host->ioaddr = ioremap_nocache(res->start, resource_size(res));
 	if (!host->ioaddr) {
 		dev_err(dev, "failed to map registers\n");
 		ret = -ENXIO;
 		goto err_req_regs;
 	}

 	/* Ensure we have minimal gpio selected CMD/CLK/Detect */
 	if (pdata->cfg_gpio)
 		pdata->cfg_gpio(pdev, pdata->max_width);

 	host->hw_name = "samsung-hsmmc";
 	host->ops = &sdhci_s3c_ops;
 	host->quirks = 0;
 	host->irq = irq;

 	/* Setup quirks for the controller */
 	host->quirks |= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC;

 #ifndef CONFIG_MMC_SDHCI_S3C_DMA

 	/* we currently see overruns on errors, so disable the SDMA
 	 * support as well. */
 	host->quirks |= SDHCI_QUIRK_BROKEN_DMA;

 #endif /* CONFIG_MMC_SDHCI_S3C_DMA */

 	/* It seems we do not get an DATA transfer complete on non-busy
 	 * transfers, not sure if this is a problem with this specific
 	 * SDHCI block, or a missing configuration that needs to be set. */
 	host->quirks |= SDHCI_QUIRK_NO_BUSY_IRQ;

 	host->quirks |= (SDHCI_QUIRK_32BIT_DMA_ADDR |
 			 SDHCI_QUIRK_32BIT_DMA_SIZE);

 	ret = sdhci_add_host(host);
 	if (ret) {
 		dev_err(dev, "sdhci_add_host() failed\n");
 		goto err_add_host;
 	}

 	return 0;

  err_add_host:
 	release_resource(sc->ioarea);
 	kfree(sc->ioarea);

  err_req_regs:
 	for (ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
 		clk_disable(sc->clk_bus[ptr]);
 		clk_put(sc->clk_bus[ptr]);
 	}

  err_no_busclks:
 	clk_disable(sc->clk_io);
 	clk_put(sc->clk_io);

  err_io_clk:
 	sdhci_free_host(host);

 	return ret;
 }

 static int __devexit sdhci_s3c_remove(struct platform_device *pdev)
 {
 	return 0;
 }

 #ifdef CONFIG_PM

 static int sdhci_s3c_suspend(struct platform_device *dev, pm_message_t pm)
 {
 	struct sdhci_host *host = platform_get_drvdata(dev);

 	sdhci_suspend_host(host, pm);
 	return 0;
 }

 static int sdhci_s3c_resume(struct platform_device *dev)
 {
 	struct sdhci_host *host = platform_get_drvdata(dev);

 	sdhci_resume_host(host);
 	return 0;
 }

 #else
 #define sdhci_s3c_suspend NULL
 #define sdhci_s3c_resume NULL
 #endif

 static struct platform_driver sdhci_s3c_driver = {
 	.probe		= sdhci_s3c_probe,
 	.remove		= __devexit_p(sdhci_s3c_remove),
 	.suspend	= sdhci_s3c_suspend,
 	.resume	        = sdhci_s3c_resume,
 	.driver		= {
 		.owner	= THIS_MODULE,
 		.name	= "s3c-sdhci",
 	},
 };

 static int __init sdhci_s3c_init(void)
 {
 	return platform_driver_register(&sdhci_s3c_driver);
 }

 static void __exit sdhci_s3c_exit(void)
 {
 	platform_driver_unregister(&sdhci_s3c_driver);
 }

 module_init(sdhci_s3c_init);
 module_exit(sdhci_s3c_exit);

 MODULE_DESCRIPTION("Samsung SDHCI (HSMMC) glue");
 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:s3c-sdhci");
	/* linux/drivers/mmc/host/sdhci-s3c.c
	*
	* Copyright 2008 Openmoko Inc.
	* Copyright 2008 Simtec Electronics
	* Ben Dooks <ben@simtec.co.uk>
	* http://armlinux.simtec.co.uk/
	*
	* SDHCI (HSMMC) support for Samsung SoC
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/delay.h>
	#include <linux/dma-mapping.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/clk.h>
	#include <linux/io.h>

	#include <linux/mmc/host.h>

	#include <plat/sdhci.h>
	#include <plat/regs-sdhci.h>

	#include "sdhci.h"

	#define MAX_BUS_CLK (4)

	/**
	* struct sdhci_s3c - S3C SDHCI instance
	* @host: The SDHCI host created
	* @pdev: The platform device we where created from.
	* @ioarea: The resource created when we claimed the IO area.
	* @pdata: The platform data for this controller.
	* @cur_clk: The index of the current bus clock.
	* @clk_io: The clock for the internal bus interface.
	* @clk_bus: The clocks that are available for the SD/MMC bus clock.
	*/
	struct sdhci_s3c {
	struct sdhci_host *host;
	struct platform_device *pdev;
	struct resource *ioarea;
	struct s3c_sdhci_platdata *pdata;
	unsigned int cur_clk;

	struct clk *clk_io;
	struct clk *clk_bus[MAX_BUS_CLK];
	};

	static inline struct sdhci_s3c to_s3c(struct sdhci_host host)
	{
	return sdhci_priv(host);
	}

	/**
	* get_curclk - convert ctrl2 register to clock source number
	* @ctrl2: Control2 register value.
	*/
	static u32 get_curclk(u32 ctrl2)
	{
	ctrl2 &= S3C_SDHCI_CTRL2_SELBASECLK_MASK;
	ctrl2 >>= S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;

	return ctrl2;
	}

	static void sdhci_s3c_check_sclk(struct sdhci_host *host)
	{
	struct sdhci_s3c *ourhost = to_s3c(host);
	u32 tmp = readl(host->ioaddr + S3C_SDHCI_CONTROL2);

	if (get_curclk(tmp) != ourhost->cur_clk) {
	dev_dbg(&ourhost->pdev->dev, "restored ctrl2 clock setting\n");

	tmp &= ~S3C_SDHCI_CTRL2_SELBASECLK_MASK;
	tmp \|= ourhost->cur_clk << S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;
	writel(tmp, host->ioaddr + 0x80);
	}
	}

	/**
	* sdhci_s3c_get_max_clk - callback to get maximum clock frequency.
	* @host: The SDHCI host instance.
	*
	* Callback to return the maximum clock rate acheivable by the controller.
	*/
	static unsigned int sdhci_s3c_get_max_clk(struct sdhci_host *host)
	{
	struct sdhci_s3c *ourhost = to_s3c(host);
	struct clk *busclk;
	unsigned int rate, max;
	int clk;

	/* note, a reset will reset the clock source */

	sdhci_s3c_check_sclk(host);

	for (max = 0, clk = 0; clk < MAX_BUS_CLK; clk++) {
	busclk = ourhost->clk_bus[clk];
	if (!busclk)
	continue;

	rate = clk_get_rate(busclk);
	if (rate > max)
	max = rate;
	}

	return max;
	}

	static unsigned int sdhci_s3c_get_timeout_clk(struct sdhci_host *host)
	{
	return sdhci_s3c_get_max_clk(host) / 1000000;
	}

	/**
	* sdhci_s3c_consider_clock - consider one the bus clocks for current setting
	* @ourhost: Our SDHCI instance.
	* @src: The source clock index.
	* @wanted: The clock frequency wanted.
	*/
	static unsigned int sdhci_s3c_consider_clock(struct sdhci_s3c *ourhost,
	unsigned int src,
	unsigned int wanted)
	{
	unsigned long rate;
	struct clk *clksrc = ourhost->clk_bus[src];
	int div;

	if (!clksrc)
	return UINT_MAX;

	rate = clk_get_rate(clksrc);

	for (div = 1; div < 256; div *= 2) {
	if ((rate / div) <= wanted)
	break;
	}

	dev_dbg(&ourhost->pdev->dev, "clk %d: rate %ld, want %d, got %ld\n",
	src, rate, wanted, rate / div);

	return (wanted - (rate / div));
	}

	/**
	* sdhci_s3c_set_clock - callback on clock change
	* @host: The SDHCI host being changed
	* @clock: The clock rate being requested.
	*
	* When the card's clock is going to be changed, look at the new frequency
	* and find the best clock source to go with it.
	*/
	static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock)
	{
	struct sdhci_s3c *ourhost = to_s3c(host);
	unsigned int best = UINT_MAX;
	unsigned int delta;
	int best_src = 0;
	int src;
	u32 ctrl;

	/* don't bother if the clock is going off. */
	if (clock == 0)
	return;

	for (src = 0; src < MAX_BUS_CLK; src++) {
	delta = sdhci_s3c_consider_clock(ourhost, src, clock);
	if (delta < best) {
	best = delta;
	best_src = src;
	}
	}

	dev_dbg(&ourhost->pdev->dev,
	"selected source %d, clock %d, delta %d\n",
	best_src, clock, best);

	/* select the new clock source */

	if (ourhost->cur_clk != best_src) {
	struct clk *clk = ourhost->clk_bus[best_src];

	/* turn clock off to card before changing clock source */
	writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);

	ourhost->cur_clk = best_src;
	host->max_clk = clk_get_rate(clk);
	host->timeout_clk = sdhci_s3c_get_timeout_clk(host);

	ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
	ctrl &= ~S3C_SDHCI_CTRL2_SELBASECLK_MASK;
	ctrl \|= best_src << S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;
	writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL2);
	}

	/* reconfigure the hardware for new clock rate */

	{
	struct mmc_ios ios;

	ios.clock = clock;

	if (ourhost->pdata->cfg_card)
	(ourhost->pdata->cfg_card)(ourhost->pdev, host->ioaddr,
	&ios, NULL);
	}
	}

	static struct sdhci_ops sdhci_s3c_ops = {
	.get_max_clock = sdhci_s3c_get_max_clk,
	.get_timeout_clock = sdhci_s3c_get_timeout_clk,
	.set_clock = sdhci_s3c_set_clock,
	};

	static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
	{
	struct s3c_sdhci_platdata *pdata = pdev->dev.platform_data;
	struct device *dev = &pdev->dev;
	struct sdhci_host *host;
	struct sdhci_s3c *sc;
	struct resource *res;
	int ret, irq, ptr, clks;

	if (!pdata) {
	dev_err(dev, "no device data specified\n");
	return -ENOENT;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
	dev_err(dev, "no irq specified\n");
	return irq;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
	dev_err(dev, "no memory specified\n");
	return -ENOENT;
	}

	host = sdhci_alloc_host(dev, sizeof(struct sdhci_s3c));
	if (IS_ERR(host)) {
	dev_err(dev, "sdhci_alloc_host() failed\n");
	return PTR_ERR(host);
	}

	sc = sdhci_priv(host);

	sc->host = host;
	sc->pdev = pdev;
	sc->pdata = pdata;

	platform_set_drvdata(pdev, host);

	sc->clk_io = clk_get(dev, "hsmmc");
	if (IS_ERR(sc->clk_io)) {
	dev_err(dev, "failed to get io clock\n");
	ret = PTR_ERR(sc->clk_io);
	goto err_io_clk;
	}

	/* enable the local io clock and keep it running for the moment. */
	clk_enable(sc->clk_io);

	for (clks = 0, ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
	struct clk *clk;
	char *name = pdata->clocks[ptr];

	if (name == NULL)
	continue;

	clk = clk_get(dev, name);
	if (IS_ERR(clk)) {
	dev_err(dev, "failed to get clock %s\n", name);
	continue;
	}

	clks++;
	sc->clk_bus[ptr] = clk;
	clk_enable(clk);

	dev_info(dev, "clock source %d: %s (%ld Hz)\n",
	ptr, name, clk_get_rate(clk));
	}

	if (clks == 0) {
	dev_err(dev, "failed to find any bus clocks\n");
	ret = -ENOENT;
	goto err_no_busclks;
	}

	sc->ioarea = request_mem_region(res->start, resource_size(res),
	mmc_hostname(host->mmc));
	if (!sc->ioarea) {
	dev_err(dev, "failed to reserve register area\n");
	ret = -ENXIO;
	goto err_req_regs;
	}

	host->ioaddr = ioremap_nocache(res->start, resource_size(res));
	if (!host->ioaddr) {
	dev_err(dev, "failed to map registers\n");
	ret = -ENXIO;
	goto err_req_regs;
	}

	/* Ensure we have minimal gpio selected CMD/CLK/Detect */
	if (pdata->cfg_gpio)
	pdata->cfg_gpio(pdev, pdata->max_width);

	host->hw_name = "samsung-hsmmc";
	host->ops = &sdhci_s3c_ops;
	host->quirks = 0;
	host->irq = irq;

	/* Setup quirks for the controller */
	host->quirks \|= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC;

	#ifndef CONFIG_MMC_SDHCI_S3C_DMA

	/* we currently see overruns on errors, so disable the SDMA
	* support as well. */
	host->quirks \|= SDHCI_QUIRK_BROKEN_DMA;

	#endif /* CONFIG_MMC_SDHCI_S3C_DMA */

	/* It seems we do not get an DATA transfer complete on non-busy
	* transfers, not sure if this is a problem with this specific
	* SDHCI block, or a missing configuration that needs to be set. */
	host->quirks \|= SDHCI_QUIRK_NO_BUSY_IRQ;

	host->quirks \|= (SDHCI_QUIRK_32BIT_DMA_ADDR \|
	SDHCI_QUIRK_32BIT_DMA_SIZE);

	ret = sdhci_add_host(host);
	if (ret) {
	dev_err(dev, "sdhci_add_host() failed\n");
	goto err_add_host;
	}

	return 0;

	err_add_host:
	release_resource(sc->ioarea);
	kfree(sc->ioarea);

	err_req_regs:
	for (ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
	clk_disable(sc->clk_bus[ptr]);
	clk_put(sc->clk_bus[ptr]);
	}

	err_no_busclks:
	clk_disable(sc->clk_io);
	clk_put(sc->clk_io);

	err_io_clk:
	sdhci_free_host(host);

	return ret;
	}

	static int __devexit sdhci_s3c_remove(struct platform_device *pdev)
	{
	return 0;
	}

	#ifdef CONFIG_PM

	static int sdhci_s3c_suspend(struct platform_device *dev, pm_message_t pm)
	{
	struct sdhci_host *host = platform_get_drvdata(dev);

	sdhci_suspend_host(host, pm);
	return 0;
	}

	static int sdhci_s3c_resume(struct platform_device *dev)
	{
	struct sdhci_host *host = platform_get_drvdata(dev);

	sdhci_resume_host(host);
	return 0;
	}

	#else
	#define sdhci_s3c_suspend NULL
	#define sdhci_s3c_resume NULL
	#endif

	static struct platform_driver sdhci_s3c_driver = {
	.probe = sdhci_s3c_probe,
	.remove = __devexit_p(sdhci_s3c_remove),
	.suspend = sdhci_s3c_suspend,
	.resume = sdhci_s3c_resume,
	.driver = {
	.owner = THIS_MODULE,
	.name = "s3c-sdhci",
	},
	};

	static int __init sdhci_s3c_init(void)
	{
	return platform_driver_register(&sdhci_s3c_driver);
	}

	static void __exit sdhci_s3c_exit(void)
	{
	platform_driver_unregister(&sdhci_s3c_driver);
	}

	module_init(sdhci_s3c_init);
	module_exit(sdhci_s3c_exit);

	MODULE_DESCRIPTION("Samsung SDHCI (HSMMC) glue");
	MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:s3c-sdhci");